Adding upstream version 3.1.0+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

CMakeModules/FindPCRE2.cmake

@@ -0,0 +1,66 @@
+# - Find pcre
+# Find the native PCRE2 headers and libraries.
+#
+# PCRE2_INCLUDE_DIRS    - where to find pcre.h, etc.
+# PCRE2_LIBRARIES   - List of libraries when using pcre.
+# PCRE2_FOUND   - True if pcre found.
+include(FindPackageHandleStandardArgs)
+
+if(PCRE2_LIBRARIES AND PCRE2_INCLUDE_DIRS)
+    # in cache already
+    set(PCRE2_FOUND TRUE)
+else()
+    find_path(PCRE2_INCLUDE_DIR
+        NAMES
+        pcre2.h
+        PATHS
+        /usr/include
+        /usr/local/include
+        /opt/local/include
+        /sw/include
+        ${CMAKE_INCLUDE_PATH}
+        ${CMAKE_INSTALL_PREFIX}/include)
+
+    # Look for the library.
+    if (WIN32 AND "${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
+        # For the Debug build, the pcre2 library is called pcre2-8d. The Release build should be pcre2-8.
+        find_library(PCRE2_LIBRARY pcre2-8d)
+    else()
+        find_library(PCRE2_LIBRARY
+            NAMES
+            pcre2-8
+            PATHS
+            /usr/lib
+            /usr/lib64
+            /usr/local/lib
+            /usr/local/lib64
+            /opt/local/lib
+            /sw/lib
+            ${CMAKE_LIBRARY_PATH}
+            ${CMAKE_INSTALL_PREFIX}/lib)
+    endif()
+
+    if(PCRE2_INCLUDE_DIR AND PCRE2_LIBRARY)
+        # learn pcre2 version
+        file(STRINGS ${PCRE2_INCLUDE_DIR}/pcre2.h PCRE2_VERSION_MAJOR
+            REGEX "#define[ ]+PCRE2_MAJOR[ ]+[0-9]+")
+        string(REGEX MATCH " [0-9]+" PCRE2_VERSION_MAJOR ${PCRE2_VERSION_MAJOR})
+        string(STRIP "${PCRE2_VERSION_MAJOR}" PCRE2_VERSION_MAJOR)
+
+        file(STRINGS ${PCRE2_INCLUDE_DIR}/pcre2.h PCRE2_VERSION_MINOR
+            REGEX "#define[ ]+PCRE2_MINOR[ ]+[0-9]+")
+        string(REGEX MATCH " [0-9]+" PCRE2_VERSION_MINOR ${PCRE2_VERSION_MINOR})
+        string(STRIP "${PCRE2_VERSION_MINOR}" PCRE2_VERSION_MINOR)
+
+        set(PCRE2_VERSION ${PCRE2_VERSION_MAJOR}.${PCRE2_VERSION_MINOR})
+    endif()
+
+    set(PCRE2_INCLUDE_DIRS ${PCRE2_INCLUDE_DIR})
+    set(PCRE2_LIBRARIES ${PCRE2_LIBRARY})
+    mark_as_advanced(PCRE2_INCLUDE_DIRS PCRE2_LIBRARIES)
+
+    # Handle the QUIETLY and REQUIRED arguments and set PCRE2_FOUND to TRUE if all listed variables are TRUE.
+    find_package_handle_standard_args(PCRE2 FOUND_VAR PCRE2_FOUND
+        REQUIRED_VARS PCRE2_LIBRARY PCRE2_INCLUDE_DIR
+        VERSION_VAR PCRE2_VERSION)
+endif()